"Overspray" (epoxy floor sealer?) (Ashdale, S. of Gerrard Library)

We have two buckets of this and we think it was left behind when some guys did an epoxy layer on our basement concrete floor. We think this product's name is "Overspray" based on the italics (probably if you know what this is, you already recognize it). We've had these for about 10-15 years but they still seem to be liquid on the inside.